Instructions
Select the "Music Studio" option at the main menu.
Pick the "Recording Studio" option, which allows you to create and edit your songs.
Set the song tempo, and add a drum track and bass line if you desire. After sorting through these options select "Create New Song."
Press "Right" on the control stick on your controller to begin recording. You can press "Right" again to stop the recording or press "Left" to rewind and record over a section of your song.
Press "Start" to pause the recording and enter an option menu. From here you can save and name your song and quit the session.
Play your song by entering "Quickplay" from the main menu. Scroll down the song list to the section that includes "Music Studio Songs" and select your song.